cvEvalCARTClassifier

cvEvalCARTClassifier结构体的内容在cvboost.cpp文件里面，具体内容如下：

CV_BOOST_IMPL
float cvEvalCARTClassifier( CvClassifier* classifier, CvMat* sample )
{
    CV_FUNCNAME( "cvEvalCARTClassifier" );

    int idx = 0;

    __BEGIN__;

    CV_ASSERT( classifier != NULL );
    CV_ASSERT( sample != NULL );
    CV_ASSERT( CV_MAT_TYPE( sample->type ) == CV_32FC1 );
    CV_ASSERT( sample->rows == 1 || sample->cols == 1 );

    if( sample->rows == 1 )
    {
        do
        {
            if( (CV_MAT_ELEM( (*sample), float, 0,
                    ((CvCARTClassifier*) classifier)->compidx[idx] )) <
                ((CvCARTClassifier*) classifier)->threshold[idx] )
            {
                idx = ((CvCARTClassifier*) classifier)->left[idx];
            }
            else
            {
                idx = ((CvCARTClassifier*) classifier)->right[idx];
            }
        } while( idx > 0 );
    }
    else
    {
        do
        {
            if( (CV_MAT_ELEM( (*sample), float,
                    ((CvCARTClassifier*) classifier)->compidx[idx], 0 )) <
                ((CvCARTClassifier*) classifier)->threshold[idx] )
            {
                idx = ((CvCARTClassifier*) classifier)->left[idx];
            }
            else
            {
                idx = ((CvCARTClassifier*) classifier)->right[idx];
            }
        } while( idx > 0 );
    }

    __END__;

    return ((CvCARTClassifier*) classifier)->val[-idx];
}